Load Specifications
Bullet:.243 | 100gr | Norma SSP
Bullet Manufacturer:Norma
Bullet Weight:100 gr
Bullet Diameter:0.243"
Bullet Length:<<locked>>
Caliber:.243 WSSM load data
Case Length (l3):1.663"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:53.9 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:10.5
Load data in caliber .243 WSSM with .243 | 100gr | Norma SSP bullet and 98 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-17 and ReloadSwiss RS 60.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 84% | 55,970 psi | 88% | 2910 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 57,682 psi | 90% | 2979 fps | 98.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,995 psi | 80% | 2953 fps | 99% |
| Accurate 4064 | <<locked>> | 86% | 56,260 psi | 88% | 2966 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 56,884 psi | 89% | 3068 fps | 100% |
| Accurate High Countryᴾ | <<locked>> | 100% | 55,782 psi | 87% | 3159 fps | 96.9% |
| ADI AR 2206H | <<locked>> | 82% | 55,303 psi | 87% | 2992 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 56,623 psi | 89% | 2999 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 54,331 psi | 85% | 3048 fps | 97.4% |
| ADI Benchmark 8208 | <<locked>> | 82% | 57,493 psi | 90% | 2989 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,564 psi | 87% | 3120 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 54,520 psi | 85% | 3051 fps | 97.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 57,203 psi | 90% | 3018 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 53,911 psi | 84% | 2989 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 57,580 psi | 90% | 3130 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,230 psi | 87% | 3100 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 57,246 psi | 90% | 3097 fps | 98% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,749 psi | 80% | 3035 fps | 97% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,848 psi | 75% | 2976 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,713 psi | 65% | 2881 fps | 98% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,781 psi | 86% | 3173 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,434 psi | 87% | 3012 fps | 100% |
| Bofors RP3 | <<locked>> | 86% | 54,578 psi | 86% | 2986 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,749 psi | 80% | 3035 fps | 97% |
| Bofors RP7 | <<locked>> | 92% | 57,493 psi | 90% | 3018 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 86% | 54,955 psi | 86% | 2999 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 92% | 55,521 psi | 87% | 3064 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 90% | 55,317 psi | 87% | 3022 fps | 97.9% |
| Hodgdon H4895 | <<locked>> | 82% | 55,956 psi | 88% | 3002 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 54,230 psi | 85% | 2992 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,391 psi | 88% | 3041 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 55,840 psi | 88% | 3104 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,318 psi | 57% | 1870 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 57,029 psi | 89% | 3002 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 56,797 psi | 89% | 2982 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,043 psi | 88% | 2979 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,274 psi | 87% | 2959 fps | 98.8% |
| IMR 4350 | <<locked>> | 94% | 54,940 psi | 86% | 2995 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,811 psi | 87% | 2992 fps | 98.8% |
| IMR 4831 | <<locked>> | 96% | 57,464 psi | 90% | 3061 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,303 psi | 87% | 3018 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 57,406 psi | 90% | 3031 fps | 96.3% |
| IMR 8208 XBR | <<locked>> | 82% | 57,493 psi | 90% | 2989 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 55,898 psi | 88% | 2966 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 54,360 psi | 85% | 2913 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 56,231 psi | 88% | 2972 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,767 psi | 87% | 2989 fps | 99.6% |
| Lovex S070 | <<locked>> | 94% | 57,116 psi | 90% | 3031 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,279 psi | 66% | 2795 fps | 97.3% |
| Norma 201 | <<locked>> | 84% | 57,609 psi | 90% | 2986 fps | 100% |
| Norma 202 | <<locked>> | 82% | 54,766 psi | 86% | 2933 fps | 100% |
| Norma 203B | <<locked>> | 86% | 57,000 psi | 89% | 3031 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,492 psi | 87% | 3045 fps | 97.5% |
| Norma MRPᴾ | <<locked>> | 100% | 53,882 psi | 84% | 3123 fps | 98.8% |
| Norma URP | <<locked>> | 94% | 55,738 psi | 87% | 3058 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 57,609 psi | 90% | 3054 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 54,259 psi | 85% | 3048 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,956 psi | 58% | 1913 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 54,882 psi | 86% | 2979 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 54,665 psi | 86% | 3054 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 54,592 psi | 86% | 3091 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 56,840 psi | 89% | 3094 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,274 psi | 87% | 3120 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 84% | 54,984 psi | 86% | 2940 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 54,447 psi | 85% | 2979 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 56,057 psi | 88% | 3018 fps | 96.6% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,246 psi | 88% | 3081 fps | 98% |
| Rottweil R 907 | <<locked>> | 92% | 57,493 psi | 90% | 3018 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,767 psi | 87% | 2989 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 82% | 55,898 psi | 88% | 2966 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 56,231 psi | 88% | 2972 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 57,116 psi | 90% | 3031 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 56,246 psi | 88% | 3041 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 56,869 psi | 89% | 2999 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 57,464 psi | 90% | 3018 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,158 psi | 86% | 2867 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,941 psi | 88% | 2867 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,579 psi | 87% | 2940 fps | 98.9% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,753 psi | 87% | 3074 fps | 97.9% |
| Somchem S335 | <<locked>> | 82% | 54,737 psi | 86% | 2864 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,391 psi | 88% | 2982 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 54,636 psi | 86% | 2976 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 54,549 psi | 85% | 3054 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 57,188 psi | 90% | 3058 fps | 98.7% |
| Vihtavuori N133 | <<locked>> | 82% | 55,651 psi | 87% | 2848 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 54,853 psi | 86% | 2890 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,317 psi | 87% | 2910 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 55,825 psi | 87% | 2949 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,230 psi | 85% | 2992 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,313 psi | 77% | 2910 fps | 97% |
| Vihtavuori N540 | <<locked>> | 86% | 57,072 psi | 89% | 2956 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 57,101 psi | 89% | 3054 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,563 psi | 84% | 3054 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 57,740 psi | 90% | 3015 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,912 psi | 88% | 3071 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,192 psi | 68% | 3022 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 57,508 psi | 90% | 3022 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,519 psi | 84% | 2989 fps | 97.2% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 49,153 psi | 77% | 2808 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,253 psi | 74% | 2802 fps | 96.7% |
| Accurate 3100 | <<locked>> | 90% | 36,172 psi | 57% | 2661 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 46,557 psi | 73% | 2812 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,114 psi | 55% | 2654 fps | 96.9% |
| Accurate High Country | <<locked>> | 96% | 48,486 psi | 76% | 3028 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 51,982 psi | 81% | 2936 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,106 psi | 69% | 2782 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 92% | 44,788 psi | 70% | 2871 fps | 95% |
| ADI Benchmark 8208 | <<locked>> | 80% | 54,085 psi | 85% | 2936 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,428 psi | 76% | 2999 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 44,701 psi | 70% | 2867 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,454 psi | 70% | 2808 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,558 psi | 75% | 2877 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,447 psi | 54% | 2664 fps | 96.9% |
| Alliant Reloder-17 | 38.5 gr | 80% | 39,001 psi | 61% | 2799 fps | 99.4% |
| Alliant Reloder-19 | <<locked>> | 92% | 44,150 psi | 69% | 2858 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 96% | 44,280 psi | 69% | 2907 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 82% | 26,890 psi | 42% | 2461 fps | 95% |
| Alliant Reloder-25 | <<locked>> | 94% | 34,577 psi | 54% | 2697 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 86% | 32,938 psi | 52% | 2700 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,750 psi | 81% | 2953 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 44,643 psi | 70% | 2818 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 44,280 psi | 69% | 2907 fps | 95.2% |
| Bofors RP7 | <<locked>> | 82% | 42,018 psi | 66% | 2733 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 45,165 psi | 71% | 2825 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 82% | 39,755 psi | 62% | 2762 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 84% | 45,919 psi | 72% | 2851 fps | 95.9% |
| Hodgdon H4895 | <<locked>> | 80% | 52,562 psi | 82% | 2946 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,053 psi | 50% | 2559 fps | 97.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,979 psi | 77% | 2923 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 41,684 psi | 65% | 2835 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,108 psi | 42% | 1673 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,343 psi | 79% | 2897 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 53,171 psi | 83% | 2930 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,354 psi | 73% | 2815 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,907 psi | 77% | 2848 fps | 97.8% |
| IMR 4350 | <<locked>> | 86% | 42,583 psi | 67% | 2766 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,031 psi | 64% | 2713 fps | 95.7% |
| IMR 4831 | <<locked>> | 80% | 33,982 psi | 53% | 2612 fps | 96.6% |
| IMR 4895 | <<locked>> | 80% | 48,762 psi | 76% | 2907 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 53,969 psi | 85% | 2976 fps | 95.5% |
| IMR 8208 XBR | <<locked>> | 80% | 54,085 psi | 85% | 2936 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 52,069 psi | 82% | 2910 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,126 psi | 80% | 2864 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,644 psi | 73% | 2818 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,479 psi | 60% | 2661 fps | 96.5% |
| Lovex S070 | <<locked>> | 82% | 39,088 psi | 61% | 2694 fps | 95.5% |
| Lovex S071 | <<locked>> | 96% | 36,985 psi | 58% | 2680 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 50,850 psi | 80% | 2884 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,445 psi | 81% | 2881 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,905 psi | 74% | 2864 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 45,397 psi | 71% | 2864 fps | 95.1% |
| Norma MRP | <<locked>> | 92% | 40,654 psi | 64% | 2861 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 35,099 psi | 55% | 2651 fps | 96.7% |
| Ramshot Big Game | <<locked>> | 80% | 47,079 psi | 74% | 2884 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 36,303 psi | 57% | 2690 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,456 psi | 43% | 1709 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,295 psi | 71% | 2808 fps | 97.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,184 psi | 80% | 2999 fps | 99.9% |
| ReloadSwiss RS 60 | 38.5 gr | 80% | 41,437 psi | 65% | 2861 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,940 psi | 55% | 2674 fps | 96.5% |
| ReloadSwiss RS 70 | 39.1 gr | 80% | 34,185 psi | 54% | 2671 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 48,530 psi | 76% | 2835 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,018 psi | 66% | 2759 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 94% | 49,342 psi | 77% | 2904 fps | 95% |
| Rottweil R 905 | <<locked>> | 94% | 46,108 psi | 72% | 2900 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 82% | 42,018 psi | 66% | 2733 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,479 psi | 60% | 2661 fps | 96.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,069 psi | 82% | 2910 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,644 psi | 73% | 2818 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 39,088 psi | 61% | 2694 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,105 psi | 68% | 2815 fps | 99.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 53,040 psi | 83% | 2940 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,517 psi | 79% | 2907 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,721 psi | 81% | 2815 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,613 psi | 68% | 2677 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 40,190 psi | 63% | 2657 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 45,672 psi | 72% | 2894 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 51,503 psi | 81% | 2815 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,649 psi | 83% | 2927 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,453 psi | 67% | 2762 fps | 99.7% |
| Somchem S365 | <<locked>> | 80% | 31,589 psi | 50% | 2605 fps | 98.8% |
| Somchem S385 | <<locked>> | 90% | 40,959 psi | 64% | 2762 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 52,214 psi | 82% | 2799 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,501 psi | 76% | 2799 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,791 psi | 76% | 2812 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,495 psi | 63% | 2690 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 36,463 psi | 57% | 2654 fps | 97.2% |
| Vihtavuori N165 | <<locked>> | 96% | 42,975 psi | 67% | 2792 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 47,166 psi | 74% | 2805 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,998 psi | 56% | 2654 fps | 96.8% |
| Vihtavuori N555 | <<locked>> | 82% | 29,414 psi | 46% | 2543 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,839 psi | 56% | 2625 fps | 99% |
| Winchester 760 | <<locked>> | 82% | 39,755 psi | 62% | 2762 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 86% | 26,992 psi | 42% | 2543 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,430 psi | 79% | 2913 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 46,398 psi | 73% | 2864 fps | 95.6% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 98 powders for .243 WSSM loaded with the .243 | 100gr | Norma SSP. Alliant Reloder-26 delivers the highest muzzle velocity at 3,173 fps; across all powders the maximum-charge window runs from 1,870 fps to 3,173 fps. Accurate 3100 gives the best case fill at 100 %, and 98 of the 98 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 100.0 gr projectile in 0.243" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, Alliant Reloder-19 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. ReloadSwiss RS 70, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .243 WSSM with the .243 | 100gr | Norma SSP they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.